google-api-ruby-client/lib/google/api_client/request.rb

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2012-10-10 20:11:49 +00:00
# Copyright 2010 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'faraday'
require 'faraday/utils'
require 'multi_json'
require 'compat/multi_json'
require 'addressable/uri'
require 'stringio'
require 'google/api_client/discovery'
module Google
class APIClient
##
# Represents an API request.
class Request
MULTIPART_BOUNDARY = "-----------RubyApiMultipartPost".freeze
# @return [Hash] Request parameters
attr_reader :parameters
# @return [Hash] Additional HTTP headers
attr_reader :headers
# @return [Google::APIClient::Method] API method to invoke
attr_reader :api_method
# @return [Google::APIClient::UploadIO] File to upload
attr_accessor :media
# @return [#generated_authenticated_request] User credentials
attr_accessor :authorization
# @return [TrueClass,FalseClass] True if request should include credentials
attr_accessor :authenticated
# @return [#read, #to_str] Request body
attr_accessor :body
##
# Build a request
#
# @param [Hash] options
# @option options [Hash, Array] :parameters
# Request parameters for the API method.
# @option options [Google::APIClient::Method] :api_method
# API method to invoke. Either :api_method or :uri must be specified
# @option options [TrueClass, FalseClass] :authenticated
# True if request should include credentials. Implicitly true if
# unspecified and :authorization present
# @option options [#generate_signed_request] :authorization
# OAuth credentials
# @option options [Google::APIClient::UploadIO] :media
# File to upload, if media upload request
# @option options [#to_json, #to_hash] :body_object
# Main body of the API request. Typically hash or object that can
# be serialized to JSON
# @option options [#read, #to_str] :body
# Raw body to send in POST/PUT requests
# @option options [String, Addressable::URI] :uri
# URI to request. Either :api_method or :uri must be specified
# @option options [String, Symbol] :http_method
# HTTP method when requesting a URI
def initialize(options={})
@parameters = Hash[options[:parameters] || {}]
@headers = Faraday::Utils::Headers.new
self.headers.merge!(options[:headers]) unless options[:headers].nil?
self.api_method = options[:api_method]
self.authenticated = options[:authenticated]
self.authorization = options[:authorization]
# These parameters are handled differently because they're not
# parameters to the API method, but rather to the API system.
self.parameters['key'] ||= options[:key] if options[:key]
self.parameters['userIp'] ||= options[:user_ip] if options[:user_ip]
if options[:media]
self.initialize_media_upload(options)
elsif options[:body]
self.body = options[:body]
elsif options[:body_object]
self.headers['Content-Type'] ||= 'application/json'
self.body = serialize_body(options[:body_object])
else
self.body = ''
end
unless self.api_method
self.http_method = options[:http_method] || 'GET'
self.uri = options[:uri]
end
end
# @!attribute [r] upload_type
# @return [String] protocol used for upload
def upload_type
return self.parameters['uploadType'] || self.parameters['upload_type']
end
# @!attribute http_method
# @return [Symbol] HTTP method if invoking a URI
def http_method
return @http_method ||= self.api_method.http_method.to_s.downcase.to_sym
end
def http_method=(new_http_method)
if new_http_method.kind_of?(Symbol)
@http_method = new_http_method.to_s.downcase.to_sym
elsif new_http_method.respond_to?(:to_str)
@http_method = new_http_method.to_s.downcase.to_sym
else
raise TypeError,
"Expected String or Symbol, got #{new_http_method.class}."
end
end
def api_method=(new_api_method)
if new_api_method.nil? || new_api_method.kind_of?(Google::APIClient::Method)
@api_method = new_api_method
else
raise TypeError,
"Expected Google::APIClient::Method, got #{new_api_method.class}."
end
end
# @!attribute uri
# @return [Addressable::URI] URI to send request
def uri
return @uri ||= self.api_method.generate_uri(self.parameters)
end
def uri=(new_uri)
@uri = Addressable::URI.parse(new_uri)
@parameters.update(@uri.query_values) unless @uri.query_values.nil?
end
# Transmits the request with the given connection
#
# @api private
#
# @param [Faraday::Connection] connection
# the connection to transmit with
#
# @return [Google::APIClient::Result]
# result of API request
def send(connection)
http_response = connection.app.call(self.to_env(connection))
result = self.process_http_response(http_response)
# Resumamble slightly different than other upload protocols in that it requires at least
# 2 requests.
if self.upload_type == 'resumable'
upload = result.resumable_upload
unless upload.complete?
result = upload.send(connection)
end
end
return result
end
# Convert to an HTTP request. Returns components in order of method, URI,
# request headers, and body
#
# @api private
#
# @return [Array<(Symbol, Addressable::URI, Hash, [#read,#to_str])>]
def to_http_request
request = (
if self.uri
unless self.parameters.empty?
self.uri.query = Addressable::URI.form_encode(self.parameters)
end
[self.http_method, self.uri.to_s, self.headers, self.body]
else
self.api_method.generate_request(self.parameters, self.body, self.headers)
end)
end
##
# Hashified verison of the API request
#
# @return [Hash]
def to_hash
options = {}
if self.api_method
options[:api_method] = self.api_method
options[:parameters] = self.parameters
else
options[:http_method] = self.http_method
options[:uri] = self.uri
end
options[:headers] = self.headers
options[:body] = self.body
options[:media] = self.media
unless self.authorization.nil?
options[:authorization] = self.authorization
end
return options
end
##
# Prepares the request for execution, building a hash of parts
# suitable for sending to Faraday::Connection.
#
# @api private
#
# @param [Faraday::Connection] connection
# Connection for building the request
#
# @return [Hash]
# Encoded request
def to_env(connection)
method, uri, headers, body = self.to_http_request
http_request = connection.build_request(method) do |req|
req.url(uri)
req.headers.update(headers)
req.body = body
end
if self.authorization.respond_to?(:generate_authenticated_request)
http_request = self.authorization.generate_authenticated_request(
:request => http_request,
:connection => connection
)
end
request_env = http_request.to_env(connection)
end
##
# Convert HTTP response to an API Result
#
# @api private
#
# @param [Faraday::Response] response
# HTTP response
#
# @return [Google::APIClient::Result]
# Processed API response
def process_http_response(response)
Result.new(self, response)
end
protected
##
# Adjust headers & body for media uploads
#
# @api private
#
# @param [Hash] options
# @option options [Hash, Array] :parameters
# Request parameters for the API method.
# @option options [Google::APIClient::UploadIO] :media
# File to upload, if media upload request
# @option options [#to_json, #to_hash] :body_object
# Main body of the API request. Typically hash or object that can
# be serialized to JSON
# @option options [#read, #to_str] :body
# Raw body to send in POST/PUT requests
def initialize_media_upload(options)
self.media = options[:media]
case self.upload_type
when "media"
if options[:body] || options[:body_object]
raise ArgumentError, "Can not specify body & body object for simple uploads"
end
self.headers['Content-Type'] ||= self.media.content_type
self.body = self.media
when "multipart"
unless options[:body_object]
raise ArgumentError, "Multipart requested but no body object"
end
metadata = StringIO.new(serialize_body(options[:body_object]))
build_multipart([Faraday::UploadIO.new(metadata, 'application/json', 'file.json'), self.media])
when "resumable"
file_length = self.media.length
self.headers['X-Upload-Content-Type'] = self.media.content_type
self.headers['X-Upload-Content-Length'] = file_length.to_s
if options[:body_object]
self.headers['Content-Type'] ||= 'application/json'
self.body = serialize_body(options[:body_object])
else
self.body = ''
end
end
end
##
# Assemble a multipart message from a set of parts
#
# @api private
#
# @param [Array<[#read,#to_str]>] parts
# Array of parts to encode.
# @param [String] mime_type
# MIME type of the message
# @param [String] boundary
# Boundary for separating each part of the message
def build_multipart(parts, mime_type = 'multipart/related', boundary = MULTIPART_BOUNDARY)
env = {
:request_headers => {'Content-Type' => "#{mime_type};boundary=#{boundary}"},
:request => { :boundary => boundary }
}
multipart = Faraday::Request::Multipart.new
self.body = multipart.create_multipart(env, parts.map {|part| [nil, part]})
self.headers.update(env[:request_headers])
end
##
# Serialize body object to JSON
#
# @api private
#
# @param [#to_json,#to_hash] body
# object to serialize
#
# @return [String]
# JSON
def serialize_body(body)
return body.to_json if body.respond_to?(:to_json)
return MultiJson.dump(options[:body_object].to_hash) if body.respond_to?(:to_hash)
raise TypeError, 'Could not convert body object to JSON.' +
'Must respond to :to_json or :to_hash.'
end
end
end
end